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Carb Settings and Specifications

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  • Carb Settings and Specifications


    Carburetor Settings and Specifications



    Specifications and stock settings for the Mikuni Carburetors found on the Suzuki Katana Motorcycle.

    Note: When tuning the fuel screws start at the stock setting, or a known good position. Make changes in increments of quarter or half turns on the screws.

    1988-1989

    600cc
    • Type BST31SS
    • Main jets 1 and 4 137.5
    • Main jets 2 and 3 135
    • Main air jet 1.0 mm
    • Jet needle (-clip position)
      • California 4CZ-5-1
      • Except California 4CZ-4-1
    • Needle jet P-8
    • Pilot jet
      • California 37.5
      • Except California 32.5
    • Pilot air jet
      • 1988
        • California 155
        • Except California 150
      • 1988
        • California 150
        • Except California 155
    • Pilot "Air/Fuel" screw setting - US models 2.5 turns
    • Starter jet 45
    • Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)


    1100cc (1988-1993)
    • Type BST34SS
    • Main jets
      • carbs 1 and 4 - 112.5
      • carbs 2 and 3 - 110
    • Main air jet 0.6mm
    • Jet needle
      • California 5DL16
      • US except California 5DL11
      • UK 5DL7-3
    • Needle jet
      • California and UK P-0
      • All other P-2
    • Pilot jet
      • California and UK 42.5
      • All other 32.5
    • Pilot air jet
      • California 155
      • US except California 135
      • UK 150
    • Pilot "Air/Fuel" screw setting
      • US 2.5 Turns out
      • 88-90 UK 2-7/16
      • 91 on UK 2-1/2
    • Float height 14.6 +/- 1mm (0.57 +/- 0.04 inch)


    1990-1997

    600cc
    • Type BST33SS
    • Main jets 112.5
    • Main air jet 0.5 mm
    • Jet needle
      • California 5F105
      • Except California 5F104
    • Needle jet P-2
    • Pilot jet 32.5
    • Pilot air jet
    • California 1.45 mm
    • Except California 1.55 mm
    • Starter jet 35
    • Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)
    • Fuel "Air/Fuel" Screws 2.5 Turns out from stop
    750 (including 1989)
    • Type BST36SS
    • Main jets
      • US, cylinder no. 3 110
      • All others 105
    • Main air jet 0.5 mm
    • Jet needle
      • California 5EZ63
        • US except California 5EZ62
        • UK 5EZ61-3
    • Needle jet
      • US Y-1
      • UK Y-2
    • Pilot jet
      • US 32.5
      • UK 37.5
    • Pilot air jet
      • 1989 and 1990 California 1.25 mm
      • 1991 on California 1.2 mm
      • US except California 1.35 mm
      • UK Preset (1-5/8 turns back)
    • Starter jet 37.5
    • Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)
    • Pilot screw setting 2.5 turns out
    1998-2006

    600
    • Type BSR32SS
    • Pilot jet 12.5 (N224.103)
    • Jet needle
      • European models (clip position) 5DH29-54 (3)
      • US and Canada models 5DH30-54
    • Needle jet P-0
    • Main jet
      • German full power Y, K1, and K2 (00-02) models 115
      • All other models
        • carbs 1 and 4 115
        • carbs 2 and 3 112.5
    • Pilot screw settings (turns out)
      • Austria and Switzerland 2 5/8
      • German restricted 2
      • German full power
        • 98-99 - 2 1/4
        • 00-02 - 2
      • All other Euro models 2 1/4
      • Canada models 2 5/8
      • US models 2.5 turns out
    • Float height 13.0 +/- .5 mm
    750
    • Type BSR36SS
    • Pilot jet
      • Austria ans Switzerland 12.5
      • All other Euro models 15
      • US and Canada 12.5
    • Jet needle
      • Austria ans Switzerland (clip position) 5DF19-53 (3)
      • All other Euro models 5DF-52 (3)
      • US and Canada 5DF21-53
    • Needle jet
      • Euro models P-0
      • US and Canada models P-0M
    • Main jet
      • Austria and Switzerland
        • carbs 1 and 4 120
        • carbs 2 and 3 117.5
      • All other Euro Models 117.5
      • US and Canada 117.5
    • Pilot screw setting (turns out)
      • Austria and Switzerland 3
      • All other Euro models
        • carbs 1 and 4 - 2
        • carbs 2 and 3 - 1 1/2
      • Canada models 3
      • US models 2.5
    • Float heights 13.0 +/- .5mm
    See also
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    Latest Articles

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    • Carb Settings and Specifications
      by Kreylyn
      Carburetor Settings and Specifications



      Specifications and stock settings for the Mikuni Carburetors found on the Suzuki Katana Motorcycle.

      Note: When tuning the fuel screws start at the stock setting, or a known good position. Make changes in increments of quarter or half turns on the screws.

      1988-1989

      600cc
      • Type BST31SS
      • Main jets 1 and 4 137.5
      • Main jets 2 and 3 135
      • Main air jet 1.0 mm
      • Jet needle (-clip position)
        • California
      ...
      06-22-2019, 03:13 PM
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      1. You need to replace one of the carb bodies.

      2. You need to replace broken or mangled linkage.

      3. You need to replace a leaking fuel T

      4. You need to dip the bodies to clean the small passages out.

      5. You need to remove the choke plungers.


      While not all of the parts...
      06-22-2019, 03:01 PM
    • Carbs 102
      by Kreylyn
      Carbs 102



      Carbs 102 PDF - for Post-98 Katanas. NOTE: USE 2 1/2 TURNS OUT, NOT 1.75! See Also...
      06-22-2019, 02:49 PM
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      Carburetor Reference Guide for pre98 bikes.


      RULE # 1 is DON'T mess with things that you don't know anything about! (Take them to a pro & pay them to fix it)

      RULE # 2 is that if you ARE going to mess with things, get a reference or some education on what you are about to mess with! (Buy the book, read it and look at the pictures!)

      Steps

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      ...
      06-22-2019, 02:43 PM
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      Pre98 600 & 750


      Fuel line hose connections and diagrams.







      1 = B 2 = A 3 = D, A vacuum line from carbs to petcock. 4 = California Model Emissions Vent/Drain (note many of the CA models were sold in other states.) 5 = E, Filler Neck Over Flow 6 = Vent/Drain Hose for fuel sender unit.
      4, 5, 6 all run to the bottom of the bike and are uncapped drain lines.

      Crank Case Vent Hose=C
      ...
      06-22-2019, 01:56 PM
    • Petcock
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      Definition


      Petcock (Noun). Device to limit or stop the flow of fuel. It is named a Fuel Cock in the Suzuki parts inventory system and most service manuals.

      Also known as a Fuelcock, Fuel-cock, or Fuel stop in common parlance.


      Positions





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